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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab555099082bd3d3111eac83479608b63f64859c0d78afe57caae55fa86e437f' 
  AND token = 'sHah0tSc/W8+nwoLY7J4SxY4typW7L3eKsjaPkOlwgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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