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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f731321abf4cc8538bc9cbf1849d4e0a6b4200a2f51bd1ae9dc7776d7ac6f3' 
  AND token = '4szoUAiywULbgff2kOM/+jKKG7wIaQay+AQWISR40eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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