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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8823ed5b022c8e06a118b13d197d8818ee79fb21c4f5501ab86666ec24a091' 
  AND token = '6uwaiSO1ld7o8aRwzrHiVl586NOV1O/2M8tPq1H4Azc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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