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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f315ccf33d56a3fb2e8ad0b53e3495053a9fb93a113b7b1617843c7f7c41d4a' 
  AND token = '1B95r+juWg3olwNSKTSHLueqjtHdgDjk7vx4slXIqUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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