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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410c4809eb7734ce57e7b96357e6f1b3c3785514eccdb2b0875c2a2ba57ad702' 
  AND token = 'mYBLnOOW5R1GHt24X7i3pdRK5JgNJAC88a1bWNPL2TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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