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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c65adf48dccefa50e95748682246556cf2d95129b5bf7cb7cd5bd07fa8b95a' 
  AND token = '+j8j1zKJ6nZ7jf9F+ky1lPs8R/qfCUbNENnH+Jnbmr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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