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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c72209b9538683aa67ffb4a3a7fde7d095b0f2de84ca2a46317a7c80556c91' 
  AND token = '/CX0ru2q6XHQGgUT2HWedsCX483z1cyhpviO/LctNnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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