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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057ef556cb8a9bb58174d804b80c4e8072ce2d0b061dd69ed5c80a2e24e0fa7f' 
  AND token = '0jwo13ayF9J5cZXUJSm7r1JpbNFlsUoWpA3qo68J2GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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