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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4560bae01801f035c1bfdc04ffcb7db2e0d8ff04817f289051feddebe11536' 
  AND token = '9vU262FM6RBcBUd9xafTDUY/JKrgjM2NgVrdwNtQpt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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