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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a107bca0ee2e09c5a8acbfc73f6264c3e9e717cc219e3c6e9134f66fd77c07' 
  AND token = 'ub0vbIeDKwJl6NE2MGS9vnOpzsNF5D4eVz3HVdTBtdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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