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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b8b5029fbd3d450e264fad2adc20d57e319dda45beb04a26b22ed49558ead7' 
  AND token = '+JyWh8W116e5qeVhJgbRhmxpbXxYQ6k8utjQ6B7zxvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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