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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f7b4f4def04d125e503c86cc471ad6bf6e32c806cd044fc2d9f0d31f6a7577' 
  AND token = 'MfbHjwwOVnB0cbMXlrIcXNFEw51z1//Y0RA+5kfmY28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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