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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b372db264df69168442d0cfab330fd2d79dfa470792dfbd7686639d14463af3' 
  AND token = '/UVOpx4Yew2lNUhcoQ4ReZ/vmTvWY8HI6nFuFdkErLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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