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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0cc251acefe4cac64c8a177dfb196e5cd26c68a95aa7b2e14b43ffa640d2ed' 
  AND token = 'dECw2rW/FGp3zEuPShl1z4Nm7aeGrfT2WbLrJFHSBcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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