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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c7f4325581e598378f92d010df46b5a8c27077f51ac7ab4574494623a88d51' 
  AND token = '+dlmPH5Z/HULLVS2MWiZ5tGi0Uq4QVOodsgavhoHER8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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