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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d161b53d7ae8f4c45d832c34310d987aecc77146f58f3f868b937058461c6d' 
  AND token = 'MS9thmgfKyKzc/Zr1Wiqc/8KATzFcf5iFohtC6l6XxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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