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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ef79fbdcd5fd7189ef4ed5e3637bcee1d68d422f2d4b0f00c203a0fa8a9159' 
  AND token = 'U9eWzm+PusActNAO7CiPWgHeXNLlEunuhPMOtQ4kU1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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