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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45ea08c0287fb409c944bc7008b35fb06d5b656f1208c54dd8354eced211088' 
  AND token = '4NivSX5pUn+mcLpJSaQRsO66yx09AEinJ+Nc6inzhME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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