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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41fb19b1df05d6823b77631dc5ce277a982983d0f5a7b31194246c295fb3ef' 
  AND token = '0y0OJmEQRhxz57sbHz1QAT8jfyxnP0w0Fw3jqOKBfTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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