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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90add66b17c183a2018c20426ad39c93b0305117de6725546fe810e4bf1bd897' 
  AND token = 'GTosOCSh4jBL3509EJv9IuFl+W5D7fDVxE6pWLKPxFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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