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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3fd39b871b3c69b8450d9059dd96eae8f5f3f9fbac1a07cb91a0047869cdbb' 
  AND token = 'aYwj9ob1FbDhpAOM+6xJJX6OjuVZ11FJdxSuhvjLtfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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