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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c4e782a9e348c0e96db0470588fe29ec23d808ef8a5e20b5428730ef3e27fc' 
  AND token = '4zqrRlau3RRSPM5Uq72c8+K2RTnGLww+e2zcpbsaEME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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