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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e77487c3f18e8c5d6fe84a202d48bb3137aa4f68175eebbe619e84bd34a4928' 
  AND token = 'nnZwaiVI/ogJ6jZUL4EPC7E3rZ1rb+frnHljgt36x1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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