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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e722dd84f62456e5bc8dd0a586a4d9afa5ccb26d0174c9e2c4b60b667fc2045d' 
  AND token = 'e31nCDjtgV6hTLpGobV/V7eH9z2MbnFkpFqcfLG0/zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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