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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6b56c3ff5db2bbb3f6b0132e975c49e14796adae9b51d71e02455f2cca3c50' 
  AND token = 'vEI01qvE0auQkAY2D6acNFF9VVoY/8Su0pwc8b25t3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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