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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85c4336bbc37df407265ea29bcc39c5bef2cbfcd7bbed7198fc81529f67cbb5' 
  AND token = 'psmVd7b1dcRIKe/uo8cCi0AvvxintV544RbDvl/CGF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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