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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99e4692fc40f0f329c8ea4ee6246e7c62b5938a26ab80f05df1ac82c7f2216e' 
  AND token = 'SF9JO4Y86YVkNNhV+97qu0bvm0NvMpg4MTpGHdQS5BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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