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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5874fd35cb48beaff7d7948e29023b654a288b4c5946e506483c1351df04c9a' 
  AND token = 'Gt7PTCUgbq/4bcp9za1pGI4t12J0qOs6AuvtUlFET5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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