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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d0b774714a0a1c92d851aaa1c71b5e8fba4190cac26ad882f194c450546c90' 
  AND token = 'CuDd0io6NKs4HpYPOvrV9UJ73Fks5ew2sAtzhRRAjno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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