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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb0a68e6195a59e7da9be1ea4f811cc0d32b413b0a96b429d8554618f0aafc4' 
  AND token = 'rt5kKNBhm1x2P/ylV6Mpa85D9CMXZTUCiibMSKmspdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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