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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce7e394f55a71ea1e005b84fe421bf5b896971af0c813f8887d082c8d3d1cfd' 
  AND token = 'Fot4GolHeK0BvKGp/aU1/SvcmLQQulx5LIYs7X9lBbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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