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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e662ee8ba15b9e4a45bb3f197f6dfbc603de988984a207899aa95e8d965f207' 
  AND token = 'LBACzeJ14u29ahgiiCG7dGGKNSqIe0QMnIohr8N8IA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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