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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33431c4897a026cf6f0a1c1785ff5de1333c8c6914fa1c70167e87e8344f71d' 
  AND token = '8M34nhCu2axHJDsPtcQJX3fbGV8Ly7TnWmacHThgB4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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