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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e355196909d72b4da44e22bc2b0be42107ec6d0e79824a80e63345bc9537ad' 
  AND token = '93YnLDxDNerF7aXjkJamszBoJJoP3oZTJO3E6zElCXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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