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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70badec1a29dc3b7d6edcbb6843d13417b6c8a22073fe257f6d4a78c7a3126ab' 
  AND token = 'ae4gPMWmfNR3IJJmZjkPUzdzyWWEf1TOkXpuF0QVETo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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