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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e547b69219328204397094a2929d11b8facec7ad6868e8e487868a95b153783c' 
  AND token = 'OB9P424wQnmf9KWGxYNOto2j5cVCwSkqva1ga3Ean8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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