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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11997ca2d75062f9bbd5b5227cc509f6c1e700ce53810df78b92c7e06f17f27' 
  AND token = 'jR0s5CjQfE1JJhWpaODuqkv4bJPwcyVHHTxff2PGLWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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