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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac83d3f8c57732b2383671b7a1a9014ea43b2e68e603552bc9e78746f2170f3' 
  AND token = 'DJc7yWbIXAYcNu2MaEoqs8CKILUOUmHPfD+pOqPJK8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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