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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ef9b624f31bd93f232e186e98f8955bb54ba74bbc1e6391373fa8864eb2ec6' 
  AND token = '3Jiz2rn4O5QuO/3+tbfGcPhGytZu4Wv/gNSun38vyiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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