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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07941f6b03a1bab11f68a4805a98658bd2e46c727946914fe11753d114e85453' 
  AND token = 'Elc2VCdOER3olAJppyV3qdTRPfCOctxwKP0h11jF84s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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