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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335ec6a85b8ba75ae805a1ae71ca2da352a14c76a71101d288d5b7627ca88202' 
  AND token = 'AuliTShGR/qACmLdyV1VEo2uB11PqaT/Ie+w3DN6/HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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