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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b02c8b8d46ebc1c995b3c5758645335f449993c3eb31575a569fe5d5815f118' 
  AND token = 'eJadcAtcGtjhbZ39GLFkfRYo+7wgDlYa/Ucbvazdz8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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