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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbb9923495caf6d793881c1c3339969033d10d1fbaba112650ba5d41183cf56' 
  AND token = '4A2cim1/phOIZ4tDe/78ej6jStqflJT8Y+N92lSCUNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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