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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02e32c6954e04128d57ad32f4b27dd4eb41157751f65ac4b99ed37808d7f0d7' 
  AND token = '4IeRWGqArXODSwvU9MPbpQg1p/4KMe99Xcmig4Zl4ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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