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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2e62f91e1b44542ee489d394d671c5d1640c6ab76d9219cd6a6c6109bd28ab' 
  AND token = 'g/8hgNwhJ0nmDcKUJtYqnj/9b+tFhUA1pZZmdoN6gJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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