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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3146a4c6cdc4c914a3fd6b9bdd8a56625246ee9e9161c4746279b8983eaad215' 
  AND token = 'T3jhLVM/R8g66KxUNlpELaOlANKOGlDNRIcOq8foe8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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