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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb15d0869fc618dc5541189f6704e4594465bbc5c4cc54ce33030483edeea0db' 
  AND token = 'DUMdQq+nh4kdufjIXu2AiW3FD1Mhe6kyWJEMQRsinqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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