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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bafa4921419ce334c53c4a8cc09d39c41e2d131d1154ee0ec647ddbe40750e' 
  AND token = 'u7NTGIO8jLRmVvw7G6Xy4dgLwNB7uyFrMraC2wWLBUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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