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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5e2e26142d41d992646c78564fd8ecc8bc8471f6caa3e6badbb14550a37f1c' 
  AND token = 'pG+O0KHAotJCtFMDflQY8PABw+Hyx02tbONloyrJSXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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