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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca625e7fa4b71f5aa1f1ca32c7d34c7331e8d349984087c44f5ce8f0b50ee05' 
  AND token = 'WB017IBnTMbfbslBUZ8TN3i8upnqm3wZGRtmr/AsGLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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