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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5213767cb08b3f19fc237ede4fd48f8ea88d9c4ff80a36ce0c9ee96fc6adbb95' 
  AND token = '7J+zfaf6rCoORabWq1R+U83P+HY9psXGKRgT0xH3WjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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