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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6fea40ddda715f0d7dba4011492e283436fb888cb83e6b1a55d05b8509f21c' 
  AND token = 'TTp/P9e2U4KNzUBLjXQFLY23xxY3Loi2kpeQwSwZKI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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