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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa74f10282653c18a7e5321ee9334a4e8774e1c05ceae36aa76020cc368e56' 
  AND token = '/XIrDMZw47VAFd91n5/Y6iLhop5j2K30nsPCefl1uOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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