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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110d6a2311e2b1943735c2cf1360b377c6635fc4d40efaf8b12b9875345be1c0' 
  AND token = 'b2icNN0FZTPexOonso3GKGVO+nkaGWH2xS9aEUfhrso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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