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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac4e5dd0c6557b2a0a30c82eb85cee390fcb1811a619235823c563f45219f79' 
  AND token = 'YT6uIbjpyAVGilycB4lB2/9yBA3QLLrVDiYX2pbOfQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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