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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f762aba92730f7fffa277012d1d232d7b392d99e5b95cc9de9e5ee55c339697' 
  AND token = '00y+GnJhtiuAnuP+yPS+4JfCL1KYBnvRc5pN4SMFKo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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