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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6362f70cc99f02c02c5ba27cbee57b494c82a413397164cc6894528a61fb3142' 
  AND token = 'R6KcZJSPkbfcn+xrWoyI6y/eCP1oYcV45mw3ni+ZiOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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