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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2c50ff5c2d14ca0204e010140b3ecc2628c4c9d3d52564a391fe35c6a4ea3a' 
  AND token = 'hPB3TeyS7hOSfKkioGMT8J44t/lPee6wiQuhEpZvFO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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