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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc76e93eb7bc576db18d98bde028f1771d4f3530d0254ce1f22de263dae2a695' 
  AND token = 'Bd1s6yrGXthktzFuKlD+B1D4frNKIgG3htOwuw7kCd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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