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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cb3a08f4c266f8a4fd4c71c39ba414130dcdadb8b6b9ef71e43f5bc69afc79' 
  AND token = 'heDwvcO9R2/pFMH/dPWY7JszJcIHiZmShpAOB/IXCcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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