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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0f9a0ad6fd3aac38792c75fe6e5fcedcaa117ea45b74ff0715fa293d12bed2' 
  AND token = '/i+AMaxCvpMmXafriwz8N0P3T/jsVCuTXhbMe5JOEik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}