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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb77d3d073642f52d98b16b7b1ee8cb96227ac56606f71a59a32b55887a5bfb' 
  AND token = 'jTTdJciNlh1o8H11Gz+XLYBTHmm36fZb1L5I2buFbfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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