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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8162e48f19f60fdf73d63ad535a7f1d320f51afe4a9ba31168bb0f08a27ff84f' 
  AND token = 'dy8MeNcN2eAfNeeSFzCImfSsZvOuFp544KN5andNMs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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