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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e307407935e36fe3c5c55f60b7271e461504aefc3d475a7b2f8f79afc3ddbf' 
  AND token = 'CQpJhLqdbVDZgG+CR+2E2QdA/GG3x87SD/GmlaZljfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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